INA281B4IDBVT

Overview

The INA281B4IDBVT is a high-precision, unidirectional current-sense amplifier manufactured by Texas Instruments. It features a fixed gain of 200 V/V and operates with a wide common-mode voltage range from -4 V to +110 V. The device offers a bandwidth of 900 kHz, a slew rate of 2.5 V/µs, and a quiescent current of 1.5 mA. It supports supply voltages between 2.7 V and 20 V, includes an offset voltage of ±30 µV (max), and functions within a temperature range of -40 °C to +125 °C in a 5-pin SOT-23 package.

Feature Summary

• Supports negative common-mode operation down to -4 V for recirculating current measurement
• Provides high-speed response with 1.3 MHz bandwidth at lower gains and fast slew rate
• Features low input bias current of 20 µA typical at maximum common-mode voltage
• Utilizes zero-drift architecture for low offset voltage and drift across the operating temperature range

Applications

• Active antenna system mMIMO (AAS)
• Macro remote radio unit (RRU)
• Solenoid control
• Valve control
• Telecom equipment power supplies

Procurement Notes

Verify the specific ordering suffix IDBVT corresponds to the tape-and-reel packaging variant when sourcing components. Confirm that the B-grade specifications regarding offset voltage and gain error align with the precision requirements of the target circuit design before finalizing procurement decisions.

Selection Notes

Select this component for applications requiring a fixed 200 V/V gain to maximize signal-to-noise ratio for small differential signals. Ensure the system can accommodate the 900 kHz bandwidth limitation compared to lower-gain variants. Verify that the single-ended output swing meets the ADC or microcontroller input requirements across the full supply voltage range.

Part Context

This part belongs to the INA281 family of high-precision current-sense amplifiers designed for demanding industrial and telecom environments. The family provides multiple gain options ranging from 20 V/V to 500 V/V to suit various dynamic ranges. The B-series designation indicates specific accuracy grades for offset and gain error compared to the A-series.

Replacement Considerations

INA281B4IDBVR

FAQ

Is the INA281B4IDBVT capable of bidirectional current sensing?

No, the INA281B4IDBVT is designed for unidirectional operation only, sensing current sourced from a power supply to a load.

What is the maximum survival voltage for the common-mode input?

The device supports a survival common-mode voltage range from -20 V to +120 V.